摘要
设计了一种太赫兹波段的雪花状双宽带极化无关超材料吸波体。采用时域有限元积分的方法对结构单元的电磁特性进行计算,结果表明结构单元在0.9~1.2 THz之间出现了两个吸收带,吸收率90%以上的频带分别是0.9642~1.002 THz和1.096~1.1316 THz,带宽分别为37.8 GHz和35.6 GHz;通过对其表面电流分布进行分析,发现其双宽带吸收特性是由不同的谐振频率叠加产生的;通过对结构单元在不同级对称性破缺下的吸收特性进行计算分析,发现结构单元的双宽带吸收特性对对称性破缺不敏感。
The snowflake dual wideband polarization-independent metamaterials absorber in the THz band was designed in this paper. The electromagnetic properties of structure unit was calculated by using time-domain finite integral method, and the results indicated that two absorption bands appeared between 0.9-1.2 THz, the two absorption bands with the absorption larger than 90% were 0.9642-1.002 THz and 1.096-1.1316 THz, and the bandwidth was 37.8 GHz and 35.6 GHz respectively. By monitoring the surface current distribution, it indicated that its wideband absorption characteristic was determined by the overlay of different resonance frequencies. By measuring the absorption characteristic of structure unit under different levels of symmetry broken, it indicated that its dual wideband absorption characteristic was not sensitive with symmetry-broken.
出处
《红外技术》
CSCD
北大核心
2016年第7期607-611,621,共6页
Infrared Technology
基金
海南省自然科学基金项目(114015)
海南省自然科学基金项目(614252)
关键词
太赫兹
双宽带
极化无关
超材料吸波体
对称性破缺效应
THz, dual wideband, polarization-independent, metamaterials absorber, symmetry-broken effect
